import $ from 'jquery';
import './jquery.ui.widget';
/*
 * jQuery File Upload Plugin 5.42.3
 * https://github.com/blueimp/jQuery-File-Upload
 *
 * Copyright 2010, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */

/* jshint nomen:false */
/* global define, require, window, document, location, Blob, FormData */

// Detect file input support, based on
// http://viljamis.com/blog/2012/file-upload-support-on-mobile/
$.support.fileInput = !(new RegExp(
  // Handle devices which give false positives for the feature detection:
  '(Android (1\\.[0156]|2\\.[01]))' +
  '|(Windows Phone (OS 7|8\\.0))|(XBLWP)|(ZuneWP)|(WPDesktop)' +
  '|(w(eb)?OSBrowser)|(webOS)' +
  '|(Kindle/(1\\.0|2\\.[05]|3\\.0))'
).test(window.navigator.userAgent) ||
  // Feature detection for all other devices:
  $('<input type="file">').prop('disabled'));

// The FileReader API is not actually used, but works as feature detection,
// as some Safari versions (5?) support XHR file uploads via the FormData API,
// but not non-multipart XHR file uploads.
// window.XMLHttpRequestUpload is not available on IE10, so we check for
// window.ProgressEvent instead to detect XHR2 file upload capability:
$.support.xhrFileUpload = !!(window.ProgressEvent && window.FileReader);
$.support.xhrFormDataFileUpload = !!window.FormData;

// Detect support for Blob slicing (required for chunked uploads):
$.support.blobSlice = window.Blob && (Blob.prototype.slice ||
  Blob.prototype.webkitSlice || Blob.prototype.mozSlice);

// Helper function to create drag handlers for dragover/dragenter/dragleave:
function getDragHandler(type) {
  var isDragOver = type === 'dragover';
  return function (e) {
    e.dataTransfer = e.originalEvent && e.originalEvent.dataTransfer;
    var dataTransfer = e.dataTransfer;
    if (dataTransfer && $.inArray('Files', dataTransfer.types) !== -1 &&
      this._trigger(
        type,
        $.Event(type, { delegatedEvent: e })
      ) !== false) {
      e.preventDefault();
      if (isDragOver) {
        dataTransfer.dropEffect = 'copy';
      }
    }
  };
}

// The fileupload widget listens for change events on file input fields defined
// via fileInput setting and paste or drop events of the given dropZone.
// In addition to the default jQuery Widget methods, the fileupload widget
// exposes the "add" and "send" methods, to add or directly send files using
// the fileupload API.
// By default, files added via file input selection, paste, drag & drop or
// "add" method are uploaded immediately, but it is possible to override
// the "add" callback option to queue file uploads.
$.widget('ui.fileupload', {

  options: {
    // The drop target element(s), by the default the complete document.
    // Set to null to disable drag & drop support:
    dropZone: $(document),
    // The paste target element(s), by the default undefined.
    // Set to a DOM node or jQuery object to enable file pasting:
    pasteZone: undefined,
    // The file input field(s), that are listened to for change events.
    // If undefined, it is set to the file input fields inside
    // of the widget element on plugin initialization.
    // Set to null to disable the change listener.
    fileInput: undefined,
    // By default, the file input field is replaced with a clone after
    // each input field change event. This is required for iframe transport
    // queues and allows change events to be fired for the same file
    // selection, but can be disabled by setting the following option to false:
    replaceFileInput: true,
    // The parameter name for the file form data (the request argument name).
    // If undefined or empty, the name property of the file input field is
    // used, or "files[]" if the file input name property is also empty,
    // can be a string or an array of strings:
    paramName: undefined,
    // By default, each file of a selection is uploaded using an individual
    // request for XHR type uploads. Set to false to upload file
    // selections in one request each:
    singleFileUploads: true,
    // To limit the number of files uploaded with one XHR request,
    // set the following option to an integer greater than 0:
    limitMultiFileUploads: undefined,
    // The following option limits the number of files uploaded with one
    // XHR request to keep the request size under or equal to the defined
    // limit in bytes:
    limitMultiFileUploadSize: undefined,
    // Multipart file uploads add a number of bytes to each uploaded file,
    // therefore the following option adds an overhead for each file used
    // in the limitMultiFileUploadSize configuration:
    limitMultiFileUploadSizeOverhead: 512,
    // Set the following option to true to issue all file upload requests
    // in a sequential order:
    sequentialUploads: false,
    // To limit the number of concurrent uploads,
    // set the following option to an integer greater than 0:
    limitConcurrentUploads: undefined,
    // Set the following option to true to force iframe transport uploads:
    forceIframeTransport: false,
    // Set the following option to the location of a redirect url on the
    // origin server, for cross-domain iframe transport uploads:
    redirect: undefined,
    // The parameter name for the redirect url, sent as part of the form
    // data and set to 'redirect' if this option is empty:
    redirectParamName: undefined,
    // Set the following option to the location of a postMessage window,
    // to enable postMessage transport uploads:
    postMessage: undefined,
    // By default, XHR file uploads are sent as multipart/form-data.
    // The iframe transport is always using multipart/form-data.
    // Set to false to enable non-multipart XHR uploads:
    multipart: true,
    // To upload large files in smaller chunks, set the following option
    // to a preferred maximum chunk size. If set to 0, null or undefined,
    // or the browser does not support the required Blob API, files will
    // be uploaded as a whole.
    maxChunkSize: undefined,
    // When a non-multipart upload or a chunked multipart upload has been
    // aborted, this option can be used to resume the upload by setting
    // it to the size of the already uploaded bytes. This option is most
    // useful when modifying the options object inside of the "add" or
    // "send" callbacks, as the options are cloned for each file upload.
    uploadedBytes: undefined,
    // By default, failed (abort or error) file uploads are removed from the
    // global progress calculation. Set the following option to false to
    // prevent recalculating the global progress data:
    recalculateProgress: true,
    // Interval in milliseconds to calculate and trigger progress events:
    progressInterval: 100,
    // Interval in milliseconds to calculate progress bitrate:
    bitrateInterval: 500,
    // By default, uploads are started automatically when adding files:
    autoUpload: true,

    // Error and info messages:
    messages: {
      uploadedBytes: 'Uploaded bytes exceed file size'
    },

    // Translation function, gets the message key to be translated
    // and an object with context specific data as arguments:
    i18n: function (message, context) {
      message = this.messages[message] || message.toString();
      if (context) {
        $.each(context, function (key, value) {
          message = message.replace('{' + key + '}', value);
        });
      }
      return message;
    },

    // Additional form data to be sent along with the file uploads can be set
    // using this option, which accepts an array of objects with name and
    // value properties, a function returning such an array, a FormData
    // object (for XHR file uploads), or a simple object.
    // The form of the first fileInput is given as parameter to the function:
    formData: function (form) {
      return form.serializeArray();
    },

    // The add callback is invoked as soon as files are added to the fileupload
    // widget (via file input selection, drag & drop, paste or add API call).
    // If the singleFileUploads option is enabled, this callback will be
    // called once for each file in the selection for XHR file uploads, else
    // once for each file selection.
    //
    // The upload starts when the submit method is invoked on the data parameter.
    // The data object contains a files property holding the added files
    // and allows you to override plugin options as well as define ajax settings.
    //
    // Listeners for this callback can also be bound the following way:
    // .bind('fileuploadadd', func);
    //
    // data.submit() returns a Promise object and allows to attach additional
    // handlers using jQuery's Deferred callbacks:
    // data.submit().done(func).fail(func).always(func);
    add: function (e, data) {
      if (e.isDefaultPrevented()) {
        return false;
      }
      if (data.autoUpload || (data.autoUpload !== false &&
        $(this).fileupload('option', 'autoUpload'))) {
        data.process().done(function () {
          data.submit();
        });
      }
    },

    // Other callbacks:

    // Callback for the submit event of each file upload:
    // submit: function (e, data) {}, // .bind('fileuploadsubmit', func);

    // Callback for the start of each file upload request:
    // send: function (e, data) {}, // .bind('fileuploadsend', func);

    // Callback for successful uploads:
    // done: function (e, data) {}, // .bind('fileuploaddone', func);

    // Callback for failed (abort or error) uploads:
    // fail: function (e, data) {}, // .bind('fileuploadfail', func);

    // Callback for completed (success, abort or error) requests:
    // always: function (e, data) {}, // .bind('fileuploadalways', func);

    // Callback for upload progress events:
    // progress: function (e, data) {}, // .bind('fileuploadprogress', func);

    // Callback for global upload progress events:
    // progressall: function (e, data) {}, // .bind('fileuploadprogressall', func);

    // Callback for uploads start, equivalent to the global ajaxStart event:
    // start: function (e) {}, // .bind('fileuploadstart', func);

    // Callback for uploads stop, equivalent to the global ajaxStop event:
    // stop: function (e) {}, // .bind('fileuploadstop', func);

    // Callback for change events of the fileInput(s):
    // change: function (e, data) {}, // .bind('fileuploadchange', func);

    // Callback for paste events to the pasteZone(s):
    // paste: function (e, data) {}, // .bind('fileuploadpaste', func);

    // Callback for drop events of the dropZone(s):
    // drop: function (e, data) {}, // .bind('fileuploaddrop', func);

    // Callback for dragover events of the dropZone(s):
    // dragover: function (e) {}, // .bind('fileuploaddragover', func);

    // Callback for the start of each chunk upload request:
    // chunksend: function (e, data) {}, // .bind('fileuploadchunksend', func);

    // Callback for successful chunk uploads:
    // chunkdone: function (e, data) {}, // .bind('fileuploadchunkdone', func);

    // Callback for failed (abort or error) chunk uploads:
    // chunkfail: function (e, data) {}, // .bind('fileuploadchunkfail', func);

    // Callback for completed (success, abort or error) chunk upload requests:
    // chunkalways: function (e, data) {}, // .bind('fileuploadchunkalways', func);

    // The plugin options are used as settings object for the ajax calls.
    // The following are jQuery ajax settings required for the file uploads:
    processData: false,
    contentType: false,
    cache: false,
    timeout: 0
  },

  // A list of options that require reinitializing event listeners and/or
  // special initialization code:
  _specialOptions: [
    'fileInput',
    'dropZone',
    'pasteZone',
    'multipart',
    'forceIframeTransport'
  ],

  _blobSlice: $.support.blobSlice && function () {
    var slice = this.slice || this.webkitSlice || this.mozSlice;
    return slice.apply(this, arguments);
  },

  _BitrateTimer: function () {
    this.timestamp = ((Date.now) ? Date.now() : (new Date()).getTime());
    this.loaded = 0;
    this.bitrate = 0;
    this.getBitrate = function (now, loaded, interval) {
      var timeDiff = now - this.timestamp;
      if (!this.bitrate || !interval || timeDiff > interval) {
        this.bitrate = (loaded - this.loaded) * (1000 / timeDiff) * 8;
        this.loaded = loaded;
        this.timestamp = now;
      }
      return this.bitrate;
    };
  },

  _isXHRUpload: function (options) {
    return !options.forceIframeTransport &&
      ((!options.multipart && $.support.xhrFileUpload) ||
        $.support.xhrFormDataFileUpload);
  },

  _getFormData: function (options) {
    var formData;
    if ($.type(options.formData) === 'function') {
      return options.formData(options.form);
    }
    if ($.isArray(options.formData)) {
      return options.formData;
    }
    if ($.type(options.formData) === 'object') {
      formData = [];
      $.each(options.formData, function (name, value) {
        formData.push({ name: name, value: value });
      });
      return formData;
    }
    return [];
  },

  _getTotal: function (files) {
    var total = 0;
    $.each(files, function (index, file) {
      total += file.size || 1;
    });
    return total;
  },

  _initProgressObject: function (obj) {
    var progress = {
      loaded: 0,
      total: 0,
      bitrate: 0
    };
    if (obj._progress) {
      $.extend(obj._progress, progress);
    } else {
      obj._progress = progress;
    }
  },

  _initResponseObject: function (obj) {
    var prop;
    if (obj._response) {
      for (prop in obj._response) {
        if (obj._response.hasOwnProperty(prop)) {
          delete obj._response[prop];
        }
      }
    } else {
      obj._response = {};
    }
  },

  _onProgress: function (e, data) {
    if (e.lengthComputable) {
      var now = ((Date.now) ? Date.now() : (new Date()).getTime()),
        loaded;
      if (data._time && data.progressInterval &&
        (now - data._time < data.progressInterval) &&
        e.loaded !== e.total) {
        return;
      }
      data._time = now;
      loaded = Math.floor(
        e.loaded / e.total * (data.chunkSize || data._progress.total)
      ) + (data.uploadedBytes || 0);
      // Add the difference from the previously loaded state
      // to the global loaded counter:
      this._progress.loaded += (loaded - data._progress.loaded);
      this._progress.bitrate = this._bitrateTimer.getBitrate(
        now,
        this._progress.loaded,
        data.bitrateInterval
      );
      data._progress.loaded = data.loaded = loaded;
      data._progress.bitrate = data.bitrate = data._bitrateTimer.getBitrate(
        now,
        loaded,
        data.bitrateInterval
      );
      // Trigger a custom progress event with a total data property set
      // to the file size(s) of the current upload and a loaded data
      // property calculated accordingly:
      this._trigger(
        'progress',
        $.Event('progress', { delegatedEvent: e }),
        data
      );
      // Trigger a global progress event for all current file uploads,
      // including ajax calls queued for sequential file uploads:
      this._trigger(
        'progressall',
        $.Event('progressall', { delegatedEvent: e }),
        this._progress
      );
    }
  },

  _initProgressListener: function (options) {
    var that = this,
      xhr = options.xhr ? options.xhr() : $.ajaxSettings.xhr();
    // Accesss to the native XHR object is required to add event listeners
    // for the upload progress event:
    if (xhr.upload) {
      $(xhr.upload).bind('progress', function (e) {
        var oe = e.originalEvent;
        // Make sure the progress event properties get copied over:
        e.lengthComputable = oe.lengthComputable;
        e.loaded = oe.loaded;
        e.total = oe.total;
        that._onProgress(e, options);
      });
      options.xhr = function () {
        return xhr;
      };
    }
  },

  _isInstanceOf: function (type, obj) {
    // Cross-frame instanceof check
    return Object.prototype.toString.call(obj) === '[object ' + type + ']';
  },

  _initXHRData: function (options) {
    var that = this,
      formData,
      file = options.files[0],
      // Ignore non-multipart setting if not supported:
      multipart = options.multipart || !$.support.xhrFileUpload,
      paramName = $.type(options.paramName) === 'array' ?
        options.paramName[0] : options.paramName;
    options.headers = $.extend({}, options.headers);
    if (options.contentRange) {
      options.headers['Content-Range'] = options.contentRange;
    }
    if (!multipart || options.blob || !this._isInstanceOf('File', file)) {
      options.headers['Content-Disposition'] = 'attachment; filename="' +
        encodeURI(file.name) + '"';
    }
    if (!multipart) {
      options.contentType = file.type || 'application/octet-stream';
      options.data = options.blob || file;
    } else if ($.support.xhrFormDataFileUpload) {
      if (options.postMessage) {
        // window.postMessage does not allow sending FormData
        // objects, so we just add the File/Blob objects to
        // the formData array and let the postMessage window
        // create the FormData object out of this array:
        formData = this._getFormData(options);
        if (options.blob) {
          formData.push({
            name: paramName,
            value: options.blob
          });
        } else {
          $.each(options.files, function (index, file) {
            formData.push({
              name: ($.type(options.paramName) === 'array' &&
                options.paramName[index]) || paramName,
              value: file
            });
          });
        }
      } else {
        if (that._isInstanceOf('FormData', options.formData)) {
          formData = options.formData;
        } else {
          formData = new FormData();
          $.each(this._getFormData(options), function (index, field) {
            formData.append(field.name, field.value);
          });
        }
        if (options.blob) {
          formData.append(paramName, options.blob, file.name);
        } else {
          $.each(options.files, function (index, file) {
            // This check allows the tests to run with
            // dummy objects:
            if (that._isInstanceOf('File', file) ||
              that._isInstanceOf('Blob', file)) {
              formData.append(
                ($.type(options.paramName) === 'array' &&
                  options.paramName[index]) || paramName,
                file,
                file.uploadName || file.name
              );
            }
          });
        }
      }
      options.data = formData;
    }
    // Blob reference is not needed anymore, free memory:
    options.blob = null;
  },

  _initIframeSettings: function (options) {
    var targetHost = $('<a></a>').prop('href', options.url).prop('host');
    // Setting the dataType to iframe enables the iframe transport:
    options.dataType = 'iframe ' + (options.dataType || '');
    // The iframe transport accepts a serialized array as form data:
    options.formData = this._getFormData(options);
    // Add redirect url to form data on cross-domain uploads:
    if (options.redirect && targetHost && targetHost !== location.host) {
      options.formData.push({
        name: options.redirectParamName || 'redirect',
        value: options.redirect
      });
    }
  },

  _initDataSettings: function (options) {
    if (this._isXHRUpload(options)) {
      if (!this._chunkedUpload(options, true)) {
        if (!options.data) {
          this._initXHRData(options);
        }
        this._initProgressListener(options);
      }
      if (options.postMessage) {
        // Setting the dataType to postmessage enables the
        // postMessage transport:
        options.dataType = 'postmessage ' + (options.dataType || '');
      }
    } else {
      this._initIframeSettings(options);
    }
  },

  _getParamName: function (options) {
    var fileInput = $(options.fileInput),
      paramName = options.paramName;
    if (!paramName) {
      paramName = [];
      fileInput.each(function () {
        var input = $(this),
          name = input.prop('name') || 'files[]',
          i = (input.prop('files') || [1]).length;
        while (i) {
          paramName.push(name);
          i -= 1;
        }
      });
      if (!paramName.length) {
        paramName = [fileInput.prop('name') || 'files[]'];
      }
    } else if (!$.isArray(paramName)) {
      paramName = [paramName];
    }
    return paramName;
  },

  _initFormSettings: function (options) {
    // Retrieve missing options from the input field and the
    // associated form, if available:
    if (!options.form || !options.form.length) {
      options.form = $(options.fileInput.prop('form'));
      // If the given file input doesn't have an associated form,
      // use the default widget file input's form:
      if (!options.form.length) {
        options.form = $(this.options.fileInput.prop('form'));
      }
    }
    options.paramName = this._getParamName(options);
    if (!options.url) {
      options.url = options.form.prop('action') || location.href;
    }
    // The HTTP request method must be "POST" or "PUT":
    options.type = (options.type ||
      ($.type(options.form.prop('method')) === 'string' &&
        options.form.prop('method')) || ''
    ).toUpperCase();
    if (options.type !== 'POST' && options.type !== 'PUT' &&
      options.type !== 'PATCH') {
      options.type = 'POST';
    }
    if (!options.formAcceptCharset) {
      options.formAcceptCharset = options.form.attr('accept-charset');
    }
  },

  _getAJAXSettings: function (data) {
    var options = $.extend({}, this.options, data);
    this._initFormSettings(options);
    this._initDataSettings(options);
    return options;
  },

  // jQuery 1.6 doesn't provide .state(),
  // while jQuery 1.8+ removed .isRejected() and .isResolved():
  _getDeferredState: function (deferred) {
    if (deferred.state) {
      return deferred.state();
    }
    if (deferred.isResolved()) {
      return 'resolved';
    }
    if (deferred.isRejected()) {
      return 'rejected';
    }
    return 'pending';
  },

  // Maps jqXHR callbacks to the equivalent
  // methods of the given Promise object:
  _enhancePromise: function (promise) {
    promise.success = promise.done;
    promise.error = promise.fail;
    promise.complete = promise.always;
    return promise;
  },

  // Creates and returns a Promise object enhanced with
  // the jqXHR methods abort, success, error and complete:
  _getXHRPromise: function (resolveOrReject, context, args) {
    var dfd = $.Deferred(),
      promise = dfd.promise();
    context = context || this.options.context || promise;
    if (resolveOrReject === true) {
      dfd.resolveWith(context, args);
    } else if (resolveOrReject === false) {
      dfd.rejectWith(context, args);
    }
    promise.abort = dfd.promise;
    return this._enhancePromise(promise);
  },

  // Adds convenience methods to the data callback argument:
  _addConvenienceMethods: function (e, data) {
    var that = this,
      getPromise = function (args) {
        return $.Deferred().resolveWith(that, args).promise();
      };
    data.process = function (resolveFunc, rejectFunc) {
      if (resolveFunc || rejectFunc) {
        data._processQueue = this._processQueue =
          (this._processQueue || getPromise([this])).pipe(
            function () {
              if (data.errorThrown) {
                return $.Deferred()
                  .rejectWith(that, [data]).promise();
              }
              return getPromise(arguments);
            }
          ).pipe(resolveFunc, rejectFunc);
      }
      return this._processQueue || getPromise([this]);
    };
    //功能：重新设置提交的URL地址
    //主要是参数有变化需要重新设置
    data.setSubmitURL = function (newURL) {
      that.options.url = newURL;
    },
      data.submit = function () {
        if (this.state() !== 'pending') {
          data.jqXHR = this.jqXHR =
            (that._trigger(
              'submit',
              $.Event('submit', { delegatedEvent: e }),
              this
            ) !== false) && that._onSend(e, this);
        }
        return this.jqXHR || that._getXHRPromise();
      };
    data.abort = function () {
      if (this.jqXHR) {
        return this.jqXHR.abort();
      }
      this.errorThrown = 'abort';
      that._trigger('fail', null, this);
      return that._getXHRPromise(false);
    };
    data.state = function () {
      if (this.jqXHR) {
        return that._getDeferredState(this.jqXHR);
      }
      if (this._processQueue) {
        return that._getDeferredState(this._processQueue);
      }
    };
    data.processing = function () {
      return !this.jqXHR && this._processQueue && that
        ._getDeferredState(this._processQueue) === 'pending';
    };
    data.progress = function () {
      return this._progress;
    };
    data.response = function () {
      return this._response;
    };
  },

  // Parses the Range header from the server response
  // and returns the uploaded bytes:
  _getUploadedBytes: function (jqXHR) {
    var range = jqXHR.getResponseHeader('Range'),
      parts = range && range.split('-'),
      upperBytesPos = parts && parts.length > 1 &&
        parseInt(parts[1], 10);
    return upperBytesPos && upperBytesPos + 1;
  },

  // Uploads a file in multiple, sequential requests
  // by splitting the file up in multiple blob chunks.
  // If the second parameter is true, only tests if the file
  // should be uploaded in chunks, but does not invoke any
  // upload requests:
  _chunkedUpload: function (options, testOnly) {
    options.uploadedBytes = options.uploadedBytes || 0;
    var that = this,
      file = options.files[0],
      fs = file.size,
      ub = options.uploadedBytes,
      mcs = options.maxChunkSize || fs,
      slice = this._blobSlice,
      dfd = $.Deferred(),
      promise = dfd.promise(),
      jqXHR,
      upload;
    if (!(this._isXHRUpload(options) && slice && (ub || mcs < fs)) ||
      options.data) {
      return false;
    }
    if (testOnly) {
      return true;
    }
    if (ub >= fs) {
      file.error = options.i18n('uploadedBytes');
      return this._getXHRPromise(
        false,
        options.context,
        [null, 'error', file.error]
      );
    }
    // The chunk upload method:
    upload = function () {
      // Clone the options object for each chunk upload:
      var o = $.extend({}, options),
        currentLoaded = o._progress.loaded;
      o.blob = slice.call(
        file,
        ub,
        ub + mcs,
        file.type
      );
      // Store the current chunk size, as the blob itself
      // will be dereferenced after data processing:
      o.chunkSize = o.blob.size;
      // Expose the chunk bytes position range:
      o.contentRange = 'bytes ' + ub + '-' +
        (ub + o.chunkSize - 1) + '/' + fs;
      // Process the upload data (the blob and potential form data):
      that._initXHRData(o);
      // Add progress listeners for this chunk upload:
      that._initProgressListener(o);
      jqXHR = ((that._trigger('chunksend', null, o) !== false && $.ajax(o)) ||
        that._getXHRPromise(false, o.context))
        .done(function (result, textStatus, jqXHR) {
          ub = that._getUploadedBytes(jqXHR) ||
            (ub + o.chunkSize);
          // Create a progress event if no final progress event
          // with loaded equaling total has been triggered
          // for this chunk:
          if (currentLoaded + o.chunkSize - o._progress.loaded) {
            that._onProgress($.Event('progress', {
              lengthComputable: true,
              loaded: ub - o.uploadedBytes,
              total: ub - o.uploadedBytes
            }), o);
          }
          options.uploadedBytes = o.uploadedBytes = ub;
          o.result = result;
          o.textStatus = textStatus;
          o.jqXHR = jqXHR;
          that._trigger('chunkdone', null, o);
          that._trigger('chunkalways', null, o);
          if (ub < fs) {
            // File upload not yet complete,
            // continue with the next chunk:
            upload();
          } else {
            dfd.resolveWith(
              o.context,
              [result, textStatus, jqXHR]
            );
          }
        })
        .fail(function (jqXHR, textStatus, errorThrown) {
          o.jqXHR = jqXHR;
          o.textStatus = textStatus;
          o.errorThrown = errorThrown;
          that._trigger('chunkfail', null, o);
          that._trigger('chunkalways', null, o);
          dfd.rejectWith(
            o.context,
            [jqXHR, textStatus, errorThrown]
          );
        });
    };
    this._enhancePromise(promise);
    promise.abort = function () {
      return jqXHR.abort();
    };
    upload();
    return promise;
  },

  _beforeSend: function (e, data) {
    if (this._active === 0) {
      // the start callback is triggered when an upload starts
      // and no other uploads are currently running,
      // equivalent to the global ajaxStart event:
      this._trigger('start');
      // Set timer for global bitrate progress calculation:
      this._bitrateTimer = new this._BitrateTimer();
      // Reset the global progress values:
      this._progress.loaded = this._progress.total = 0;
      this._progress.bitrate = 0;
    }
    // Make sure the container objects for the .response() and
    // .progress() methods on the data object are available
    // and reset to their initial state:
    this._initResponseObject(data);
    this._initProgressObject(data);
    data._progress.loaded = data.loaded = data.uploadedBytes || 0;
    data._progress.total = data.total = this._getTotal(data.files) || 1;
    data._progress.bitrate = data.bitrate = 0;
    this._active += 1;
    // Initialize the global progress values:
    this._progress.loaded += data.loaded;
    this._progress.total += data.total;
  },

  _onDone: function (result, textStatus, jqXHR, options) {
    var total = options._progress.total,
      response = options._response;
    if (options._progress.loaded < total) {
      // Create a progress event if no final progress event
      // with loaded equaling total has been triggered:
      this._onProgress($.Event('progress', {
        lengthComputable: true,
        loaded: total,
        total: total
      }), options);
    }
    response.result = options.result = result;
    response.textStatus = options.textStatus = textStatus;
    response.jqXHR = options.jqXHR = jqXHR;
    this._trigger('done', null, options);
  },

  _onFail: function (jqXHR, textStatus, errorThrown, options) {
    var response = options._response;
    if (options.recalculateProgress) {
      // Remove the failed (error or abort) file upload from
      // the global progress calculation:
      this._progress.loaded -= options._progress.loaded;
      this._progress.total -= options._progress.total;
    }
    response.jqXHR = options.jqXHR = jqXHR;
    response.textStatus = options.textStatus = textStatus;
    response.errorThrown = options.errorThrown = errorThrown;
    this._trigger('fail', null, options);
  },

  _onAlways: function (jqXHRorResult, textStatus, jqXHRorError, options) {
    // jqXHRorResult, textStatus and jqXHRorError are added to the
    // options object via done and fail callbacks
    this._trigger('always', null, options);
  },

  _onSend: function (e, data) {
    if (!data.submit) {
      this._addConvenienceMethods(e, data);
    }
    var that = this,
      jqXHR,
      aborted,
      slot,
      pipe,
      options = that._getAJAXSettings(data),
      send = function () {
        that._sending += 1;
        // Set timer for bitrate progress calculation:
        options._bitrateTimer = new that._BitrateTimer();
        jqXHR = jqXHR || (
          ((aborted || that._trigger(
            'send',
            $.Event('send', { delegatedEvent: e }),
            options
          ) === false) &&
            that._getXHRPromise(false, options.context, aborted)) ||
          that._chunkedUpload(options) || $.ajax(options)
        ).done(function (result, textStatus, jqXHR) {
          that._onDone(result, textStatus, jqXHR, options);
        }).fail(function (jqXHR, textStatus, errorThrown) {
          that._onFail(jqXHR, textStatus, errorThrown, options);
        }).always(function (jqXHRorResult, textStatus, jqXHRorError) {
          that._onAlways(
            jqXHRorResult,
            textStatus,
            jqXHRorError,
            options
          );
          that._sending -= 1;
          that._active -= 1;
          if (options.limitConcurrentUploads &&
            options.limitConcurrentUploads > that._sending) {
            // Start the next queued upload,
            // that has not been aborted:
            var nextSlot = that._slots.shift();
            while (nextSlot) {
              if (that._getDeferredState(nextSlot) === 'pending') {
                nextSlot.resolve();
                break;
              }
              nextSlot = that._slots.shift();
            }
          }
          if (that._active === 0) {
            // The stop callback is triggered when all uploads have
            // been completed, equivalent to the global ajaxStop event:
            that._trigger('stop');
          }
        });
        return jqXHR;
      };
    this._beforeSend(e, options);
    if (this.options.sequentialUploads ||
      (this.options.limitConcurrentUploads &&
        this.options.limitConcurrentUploads <= this._sending)) {
      if (this.options.limitConcurrentUploads > 1) {
        slot = $.Deferred();
        this._slots.push(slot);
        pipe = slot.pipe(send);
      } else {
        this._sequence = this._sequence.pipe(send, send);
        pipe = this._sequence;
      }
      // Return the piped Promise object, enhanced with an abort method,
      // which is delegated to the jqXHR object of the current upload,
      // and jqXHR callbacks mapped to the equivalent Promise methods:
      pipe.abort = function () {
        aborted = [undefined, 'abort', 'abort'];
        if (!jqXHR) {
          if (slot) {
            slot.rejectWith(options.context, aborted);
          }
          return send();
        }
        return jqXHR.abort();
      };
      return this._enhancePromise(pipe);
    }
    return send();
  },

  _onAdd: function (e, data) {
    var that = this,
      result = true,
      options = $.extend({}, this.options, data),
      files = data.files,
      filesLength = files.length,
      limit = options.limitMultiFileUploads,
      limitSize = options.limitMultiFileUploadSize,
      overhead = options.limitMultiFileUploadSizeOverhead,
      batchSize = 0,
      paramName = this._getParamName(options),
      paramNameSet,
      paramNameSlice,
      fileSet,
      i,
      j = 0;
    if (!filesLength) {
      return false;
    }
    if (limitSize && files[0].size === undefined) {
      limitSize = undefined;
    }
    if (!(options.singleFileUploads || limit || limitSize) ||
      !this._isXHRUpload(options)) {
      fileSet = [files];
      paramNameSet = [paramName];
    } else if (!(options.singleFileUploads || limitSize) && limit) {
      fileSet = [];
      paramNameSet = [];
      for (i = 0; i < filesLength; i += limit) {
        fileSet.push(files.slice(i, i + limit));
        paramNameSlice = paramName.slice(i, i + limit);
        if (!paramNameSlice.length) {
          paramNameSlice = paramName;
        }
        paramNameSet.push(paramNameSlice);
      }
    } else if (!options.singleFileUploads && limitSize) {
      fileSet = [];
      paramNameSet = [];
      for (i = 0; i < filesLength; i = i + 1) {
        batchSize += files[i].size + overhead;
        if (i + 1 === filesLength ||
          ((batchSize + files[i + 1].size + overhead) > limitSize) ||
          (limit && i + 1 - j >= limit)) {
          fileSet.push(files.slice(j, i + 1));
          paramNameSlice = paramName.slice(j, i + 1);
          if (!paramNameSlice.length) {
            paramNameSlice = paramName;
          }
          paramNameSet.push(paramNameSlice);
          j = i + 1;
          batchSize = 0;
        }
      }
    } else {
      paramNameSet = paramName;
    }
    data.originalFiles = files;
    $.each(fileSet || files, function (index, element) {
      var newData = $.extend({}, data);
      newData.files = fileSet ? element : [element];
      newData.paramName = paramNameSet[index];
      that._initResponseObject(newData);
      that._initProgressObject(newData);
      that._addConvenienceMethods(e, newData);
      result = that._trigger(
        'add',
        $.Event('add', { delegatedEvent: e }),
        newData
      );
      return result;
    });
    return result;
  },

  _replaceFileInput: function (data) {
    var input = data.fileInput,
      inputClone = input.clone(true);
    // Add a reference for the new cloned file input to the data argument:
    data.fileInputClone = inputClone;
    $('<form></form>').append(inputClone)[0].reset();
    // Detaching allows to insert the fileInput on another form
    // without loosing the file input value:
    input.after(inputClone).detach();
    // Avoid memory leaks with the detached file input:
    $.cleanData(input.unbind('remove'));
    // Replace the original file input element in the fileInput
    // elements set with the clone, which has been copied including
    // event handlers:
    this.options.fileInput = this.options.fileInput.map(function (i, el) {
      if (el === input[0]) {
        return inputClone[0];
      }
      return el;
    });
    // If the widget has been initialized on the file input itself,
    // override this.element with the file input clone:
    if (input[0] === this.element[0]) {
      this.element = inputClone;
    }
  },

  _handleFileTreeEntry: function (entry, path) {
    var that = this,
      dfd = $.Deferred(),
      errorHandler = function (e) {
        if (e && !e.entry) {
          e.entry = entry;
        }
        // Since $.when returns immediately if one
        // Deferred is rejected, we use resolve instead.
        // This allows valid files and invalid items
        // to be returned together in one set:
        dfd.resolve([e]);
      },
      successHandler = function (entries) {
        that._handleFileTreeEntries(
          entries,
          path + entry.name + '/'
        ).done(function (files) {
          dfd.resolve(files);
        }).fail(errorHandler);
      },
      readEntries = function () {
        dirReader.readEntries(function (results) {
          if (!results.length) {
            successHandler(entries);
          } else {
            entries = entries.concat(results);
            readEntries();
          }
        }, errorHandler);
      },
      dirReader, entries = [];
    path = path || '';
    if (entry.isFile) {
      if (entry._file) {
        // Workaround for Chrome bug #149735
        entry._file.relativePath = path;
        dfd.resolve(entry._file);
      } else {
        entry.file(function (file) {
          file.relativePath = path;
          dfd.resolve(file);
        }, errorHandler);
      }
    } else if (entry.isDirectory) {
      dirReader = entry.createReader();
      readEntries();
    } else {
      // Return an empy list for file system items
      // other than files or directories:
      dfd.resolve([]);
    }
    return dfd.promise();
  },

  _handleFileTreeEntries: function (entries, path) {
    var that = this;
    return $.when.apply(
      $,
      $.map(entries, function (entry) {
        return that._handleFileTreeEntry(entry, path);
      })
    ).pipe(function () {
      return Array.prototype.concat.apply(
        [],
        arguments
      );
    });
  },

  _getDroppedFiles: function (dataTransfer) {
    dataTransfer = dataTransfer || {};
    var items = dataTransfer.items;
    if (items && items.length && (items[0].webkitGetAsEntry ||
      items[0].getAsEntry)) {
      return this._handleFileTreeEntries(
        $.map(items, function (item) {
          var entry;
          if (item.webkitGetAsEntry) {
            entry = item.webkitGetAsEntry();
            if (entry) {
              // Workaround for Chrome bug #149735:
              entry._file = item.getAsFile();
            }
            return entry;
          }
          return item.getAsEntry();
        })
      );
    }
    return $.Deferred().resolve(
      $.makeArray(dataTransfer.files)
    ).promise();
  },

  _getSingleFileInputFiles: function (fileInput) {
    fileInput = $(fileInput);
    var entries = fileInput.prop('webkitEntries') ||
      fileInput.prop('entries'),
      files,
      value;
    if (entries && entries.length) {
      return this._handleFileTreeEntries(entries);
    }
    files = $.makeArray(fileInput.prop('files'));
    if (!files.length) {
      value = fileInput.prop('value');
      if (!value) {
        return $.Deferred().resolve([]).promise();
      }
      // If the files property is not available, the browser does not
      // support the File API and we add a pseudo File object with
      // the input value as name with path information removed:
      files = [{ name: value.replace(/^.*\\/, '') }];
    } else if (files[0].name === undefined && files[0].fileName) {
      // File normalization for Safari 4 and Firefox 3:
      $.each(files, function (index, file) {
        file.name = file.fileName;
        file.size = file.fileSize;
      });
    }
    return $.Deferred().resolve(files).promise();
  },

  _getFileInputFiles: function (fileInput) {
    if (!(fileInput instanceof $) || fileInput.length === 1) {
      return this._getSingleFileInputFiles(fileInput);
    }
    return $.when.apply(
      $,
      $.map(fileInput, this._getSingleFileInputFiles)
    ).pipe(function () {
      return Array.prototype.concat.apply(
        [],
        arguments
      );
    });
  },

  _onChange: function (e) {
    var that = this,
      data = {
        fileInput: $(e.target),
        form: $(e.target.form)
      };
    this._getFileInputFiles(data.fileInput).always(function (files) {
      data.files = files;
      if (that.options.replaceFileInput) {
        that._replaceFileInput(data);
      }
      if (that._trigger(
        'change',
        $.Event('change', { delegatedEvent: e }),
        data
      ) !== false) {
        that._onAdd(e, data);
      }
    });
  },

  _onPaste: function (e) {
    var items = e.originalEvent && e.originalEvent.clipboardData &&
      e.originalEvent.clipboardData.items,
      data = { files: [] };
    if (items && items.length) {
      $.each(items, function (index, item) {
        var file = item.getAsFile && item.getAsFile();
        if (file) {
          data.files.push(file);
        }
      });
      if (this._trigger(
        'paste',
        $.Event('paste', { delegatedEvent: e }),
        data
      ) !== false) {
        this._onAdd(e, data);
      }
    }
  },

  _onDrop: function (e) {
    e.dataTransfer = e.originalEvent && e.originalEvent.dataTransfer;
    var that = this,
      dataTransfer = e.dataTransfer,
      data = {};
    if (dataTransfer && dataTransfer.files && dataTransfer.files.length) {
      e.preventDefault();
      this._getDroppedFiles(dataTransfer).always(function (files) {
        data.files = files;
        if (that._trigger(
          'drop',
          $.Event('drop', { delegatedEvent: e }),
          data
        ) !== false) {
          that._onAdd(e, data);
        }
      });
    }
  },

  _onDragOver: getDragHandler('dragover'),

  _onDragEnter: getDragHandler('dragenter'),

  _onDragLeave: getDragHandler('dragleave'),

  _initEventHandlers: function () {
    if (this._isXHRUpload(this.options)) {
      this._on(this.options.dropZone, {
        dragover: this._onDragOver,
        drop: this._onDrop,
        // event.preventDefault() on dragenter is required for IE10+:
        dragenter: this._onDragEnter,
        // dragleave is not required, but added for completeness:
        dragleave: this._onDragLeave
      });
      this._on(this.options.pasteZone, {
        paste: this._onPaste
      });
    }
    if ($.support.fileInput) {
      this._on(this.options.fileInput, {
        change: this._onChange
      });
    }
  },

  _destroyEventHandlers: function () {
    this._off(this.options.dropZone, 'dragenter dragleave dragover drop');
    this._off(this.options.pasteZone, 'paste');
    this._off(this.options.fileInput, 'change');
  },

  _setOption: function (key, value) {
    var reinit = $.inArray(key, this._specialOptions) !== -1;
    if (reinit) {
      this._destroyEventHandlers();
    }
    this._super(key, value);
    if (reinit) {
      this._initSpecialOptions();
      this._initEventHandlers();
    }
  },

  _initSpecialOptions: function () {
    var options = this.options;
    if (options.fileInput === undefined) {
      options.fileInput = this.element.is('input[type="file"]') ?
        this.element : this.element.find('input[type="file"]');
    } else if (!(options.fileInput instanceof $)) {
      options.fileInput = $(options.fileInput);
    }
    if (!(options.dropZone instanceof $)) {
      options.dropZone = $(options.dropZone);
    }
    if (!(options.pasteZone instanceof $)) {
      options.pasteZone = $(options.pasteZone);
    }
  },

  _getRegExp: function (str) {
    var parts = str.split('/'),
      modifiers = parts.pop();
    parts.shift();
    return new RegExp(parts.join('/'), modifiers);
  },

  _isRegExpOption: function (key, value) {
    return key !== 'url' && $.type(value) === 'string' &&
      /^\/.*\/[igm]{0,3}$/.test(value);
  },

  _initDataAttributes: function () {
    var that = this,
      options = this.options,
      data = this.element.data();
    // Initialize options set via HTML5 data-attributes:
    $.each(
      this.element[0].attributes,
      function (index, attr) {
        var key = attr.name.toLowerCase(),
          value;
        if (/^data-/.test(key)) {
          // Convert hyphen-ated key to camelCase:
          key = key.slice(5).replace(/-[a-z]/g, function (str) {
            return str.charAt(1).toUpperCase();
          });
          value = data[key];
          if (that._isRegExpOption(key, value)) {
            value = that._getRegExp(value);
          }
          options[key] = value;
        }
      }
    );
  },

  _create: function () {
    this._initDataAttributes();
    this._initSpecialOptions();
    this._slots = [];
    this._sequence = this._getXHRPromise(true);
    this._sending = this._active = 0;
    this._initProgressObject(this);
    this._initEventHandlers();
  },

  // This method is exposed to the widget API and allows to query
  // the number of active uploads:
  active: function () {
    return this._active;
  },

  // This method is exposed to the widget API and allows to query
  // the widget upload progress.
  // It returns an object with loaded, total and bitrate properties
  // for the running uploads:
  progress: function () {
    return this._progress;
  },

  // This method is exposed to the widget API and allows adding files
  // using the fileupload API. The data parameter accepts an object which
  // must have a files property and can contain additional options:
  // .fileupload('add', {files: filesList});
  add: function (data) {
    var that = this;
    if (!data || this.options.disabled) {
      return;
    }
    if (data.fileInput && !data.files) {
      this._getFileInputFiles(data.fileInput).always(function (files) {
        data.files = files;
        that._onAdd(null, data);
      });
    } else {
      data.files = $.makeArray(data.files);
      this._onAdd(null, data);
    }
  },

  // This method is exposed to the widget API and allows sending files
  // using the fileupload API. The data parameter accepts an object which
  // must have a files or fileInput property and can contain additional options:
  // .fileupload('send', {files: filesList});
  // The method returns a Promise object for the file upload call.
  send: function (data) {
    if (data && !this.options.disabled) {
      if (data.fileInput && !data.files) {
        var that = this,
          dfd = $.Deferred(),
          promise = dfd.promise(),
          jqXHR,
          aborted;
        promise.abort = function () {
          aborted = true;
          if (jqXHR) {
            return jqXHR.abort();
          }
          dfd.reject(null, 'abort', 'abort');
          return promise;
        };
        this._getFileInputFiles(data.fileInput).always(
          function (files) {
            if (aborted) {
              return;
            }
            if (!files.length) {
              dfd.reject();
              return;
            }
            data.files = files;
            jqXHR = that._onSend(null, data);
            jqXHR.then(
              function (result, textStatus, jqXHR) {
                dfd.resolve(result, textStatus, jqXHR);
              },
              function (jqXHR, textStatus, errorThrown) {
                dfd.reject(jqXHR, textStatus, errorThrown);
              }
            );
          }
        );
        return this._enhancePromise(promise);
      }
      data.files = $.makeArray(data.files);
      if (data.files.length) {
        return this._onSend(null, data);
      }
    }
    return this._getXHRPromise(false, data && data.context);
  }

});

